61 lines
1.8 KiB
Rust
61 lines
1.8 KiB
Rust
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use std::collections::HashSet;
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use std::collections::hash_set::{Intersection, IntoIter};
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use std::io::Result;
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use std::iter::Sum;
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use crate::file::line_reader_for_file;
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pub fn main(filename: &str) -> Result<()> {
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let line_reader = line_reader_for_file(filename)?;
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let mut priority_letters: Vec<char> = Vec::new();
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for line in line_reader {
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let line = line?;
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assert!(line.len() % 2 == 0);
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let compartment_size: usize = line.len() / 2;
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let (left_compartment, right_compartment) = line.split_at(compartment_size);
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let left_compartment_set: HashSet<char> = HashSet::from_iter(left_compartment.chars());
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let right_compartment_set: HashSet<char> = HashSet::from_iter(right_compartment.chars());
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let intersection = left_compartment_set.intersection(&right_compartment_set);
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priority_letters.extend(intersection);
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}
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println!("{}", priority_letters
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.iter()
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.map(|c| String::from(*c))
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.collect::<Vec<String>>()
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.join(" "));
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const LOWERCASE_A_SCORE: u32 = 'a' as u32;
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const UPPERCASE_A_SCORE: u32 = 'A' as u32;
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let scored_priority_letters: Vec<u32> =
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priority_letters
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.iter()
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.map(|c| -> u32 {
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let char_value: u32 = (*c).into();
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if c.is_lowercase() {
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char_value - LOWERCASE_A_SCORE + 1
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} else {
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char_value - UPPERCASE_A_SCORE + 27
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}
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})
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.collect();
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println!("{}", scored_priority_letters
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.iter()
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.map(|i| i.to_string())
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.collect::<Vec<String>>()
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.join(" "));
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let sum_of_scored_priority_letters: u32 = scored_priority_letters
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.iter().sum();
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println!("Part 1: sum of scores of all priority items: {}", sum_of_scored_priority_letters);
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Ok(())
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}
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